Excuse me? You feed raw right? You don't think that she should know that 6 chicken thighs are a LOT of food? Or that it's not good to mix kibble and raw?
But yes, if I see that someone's dog is on the heavier side and the owner is still feeding too much, I feel I should tell him/her. If the owner gets offended, then it's his problem. I just feel sorry for the dog, that's all.